A solar cell can be constructed by depositing copper (II) sulfide from an aqueou

Question

A solar cell can be constructed by depositing copper (II) sulfide from an aqueous solution directly onto certain n-type silicon semiconductors. The precipitation of CuS may be represented by the following unbalanced equation: In one experiment, a 22.2 mm by 15.5 mm solar cell was prepared using 6.00mL of 0.105 M thioacetamide and 2.00 mL of 0.101 M copper (II) acetate (the source of the Cu^2+ ions). d. Report the density of CuS to at least three significant figures. Cite your source. e. What is the molar concentration of thioacetamide and copper(II) acetate the instant they are mixed? (Assume the volumes are additive.) f. What is the maximum amount of CuS, in grams, that can form (precipitate)?

Explanation / Answer

(d)

density = 4.76 g/cc   (source : wikipedia)

---------------------------------------

Total volume of the mixture = 2mL + 6mL = 8mL

concentration of thioacetamide : 6mL *0.105M/8ml = 0.079 M

concentration of copper acetate : 2mL *0.101M/8mL = 0.025 M

-------------------------------------

(f)

moles of thioacetamide = 0.105 M * 0.006 L = 6.3*10^-4 moles

moles of copper acetate = 0.101M * 0.002 L = 2.02 *10^-4 moles

copper acetate is the limiting reagent.

moles of CuS formed = 2.02 *10^-4 moles = 2.02 *10^-4 moles*95.611g/mol = 0.0193 gm

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.